I think the biggest one was actually the brain clot that almost killed him. Leaving aside the ensuing laptop scandal and suspension (no way to know if that same scandal happens in a parallel world where he stayed healthy), he would have been an experienced sophomore on that 2006 team that badly needed backcourt quickness on defense and a secondary ballhandler on offense. The 2005 team had Price and Rashad (staph infection) with serious hospital stays.
But, if Price stays healthy, he graduates in 2008, and the whole Kemba arc maybe changes. Wouldn't want to mess with any timelines that would alter that.